Best available cof



Jan. 10, 1928. 1,655,824

B. F. SCHMIDT MOTOR CONSTRUCTION HAVING COOLING OIL CIRCULATION Filed Sept. 30. 1925 2 Sheets-Sheet 1 0a 9 37 8 /o/ 23/ M f!" as 67 Jan. 10, 1928.,

B. F. SCHMIDT MOTCR CONSTRUCTION HAVING COOLING OIL CIRCULATION Filed septa 50 1925 2 Sheets-Sheet 2 M 23497491 gays/4154741474 i 57222?! .x aw z w w M W 5 Patented Jan. 10, 1928.

UNETED STATES 9ATENT'QFF'LQEZ f BEI-IJA'MIN F. SCHMIDT. OF LOS ANGELES, CALIFORNIIL ASSIG hTOR;dF ,ONEFOURTH TO KING C. (-rEL-LETTE AND ONE-FOURTH TO L'ING Gf- GILLETTE; 'BOTH 'OF LOS ANGELES, CALIFORNIA.

MOTOR CONSTRUCTIOIW HAVING COOLINGOIL application rrea September 30, 1925. Serial Ira-59 .715

This invention relates to electric motors aml conlprises a unique motor construction which especially applicable in the oil well imluu r In this industry it is general practice to pump oil from wells use of a pump which is situated near the lower end thereof. The plunger. 01'' the pump is operated lay a Wall-Ling beam situated on the .(ioor of the derrick of the well, by means of a string of sucker rods Such pumping equipment possesses disadvantages, both .in operationancl construction.

ln my patent applications trically operated oil pump,- tile d De c '9, 1924,

Serial r\'o.75i,87 l, auctMotor driven oil well pump l iledgDeca 9,-192at,. Serial N0? 754.- 870, it presented;- rto the,;l?atei1 t ;;Ofiice pumping equipmeut jin \\'hieh the driving means are placed (lirectlyadjacentfto the pump.;- This 4 construction ,elirninates the sucker rods and does away-witlrnany of'the (lisadvantages of lthe present-oi ..1)umping equipment. 1'.

h I Itis an object of this invention-to provide a motor construction comprising-a plurality of 1notor;units,,-which motor oonstruction -is particularly adapted. fonuse in 'c0njunction with an oil pump oft-he'c'harac ter shown jn my applicationsz-previously referredtoij It is another blijectof this invent-ion to providea motor construction. havinga poqel coolin oil circulation wherebytheternpera; lure or the motor may he kept comparatively low andthe eliiciexicy thereof- ;accordingly increased; Hf I It is also an object of;thi s invciit-ionaib provide a motor construction:having a rotor \rhich serres as an inipellerland'by,whiclnoil is .llilvfll through the =rotor.. and liorcegl through the stator th'ereot; It is anotherobjectoithis invention ,to provide a motor construction consisting of 'a pluraliq of motor units which" are secured and adapted to ope rate together; having a coolingoil circulation around the Units 43S well as haviiig local circulation through each of the units.

It isanother object of thisixivent-ionto provide a motorconst-ructiou having a rotor to which an impeller wheel is secured for forcing oil or other insulating 'liquid into the spae'hetween the stator and the rotor of the motor or any other space parallel to the axis of the motor. 4

entitled Elec ,With. reference.

It is a further object f it-his inviitio'nto 65 prov de a motor constru ti oh ofthis chart te ter having shell u h ichieiicloses the plural. ity 0t motor units and"havingiioentralizin means adapteclfto]. cent-riliz 'efthese 'rnotor to pro rlcle a motor; constr uotip n fiilttielhhars a ur e #1 a s eils am emi shewmg ars g ailht fia fef gir s.

spacers. employed inthi's ernbodirnentgpi lpy invention: M

5% if: (Fi s-i 2 n eete ae l =s. -.i a ease well casing whiehfl -.as .show

Well and has a seat member 21 secured at the lower end thereof, this seat member 21 having a central opening 22 formed therethrough. A pump construction 23 including a motor construction having the features of my invention is adapted to be lowered into the well casing 20. The motor construction of my invention has a shell 24 which is threaded at 25 to the upper end or a pump 26. A cap 27 is threaded at 28 to the upper end of the shell 24, this cap 27 having an eye 29 to which a cable 30 is attached, thisc'able 30 being Utilized tor loweringin to and r'aisixn the pump construction from the well'c'asing 20. The pump 21' has a gasket 82 carried on the lower end thereof which is adapted to engage a conical face 232 of the seat member 21 when it is lowered into operating position in the well casing 20 As shown in F iggl th'e lower end or the well easing 2Q is sealed when the pump con: strnction is lowered; into operating posi tion When the pnmping construction is opcr ated, .oil is drawn intoan intake port 34 of th'e'pi mp 2G. throiigh the opening 22 01' the sea t member 21 and itisex pelledfro m tlie p'iiinp26 through me-sharia pb1't"36 in tothe w'ell'cising 2Q,by means of whic h oil is conve e lie surface of the ground. The; moot'constrnction'of my invention has *a pliirality of motor ii nit s '39. shown in .vFi 2, each of the motor'nni'ts 39" I is constructed} iasi follo ws 1h S mens-i s; {mended "the renn ra 'p'ltiIal'ity of's'ectiojn s 4E6 which'afe separated b a nu ar spe 's- 7 4, 39. $1 5 ateli r. minus; 15:. ans easesa iiirdriare tj 5 fth stator with th'ex t erior thereof. These iivnhi'i'lar openings .to inclusive are provided by of spfi ce f fi whieli are formed as shoiiz'n in Figs. 12 and 13. The spacers 53 'li'a'te a main wv'all 54 811' which varies 55 which are of .radial extension are formed. Ths e space'i's 53 are placedhet'w ee'n the stamens-+10, in Fig. 2 andin Fig.{f1. "LTlie sections 451m gemifea together byend ihemtewse'tvhiii have annullzirfface's '57'3whi'ch engagethe opposite entls o f the stator'g tfi. Rds58 e z ft en'd tfirmignthe end members to and thro wh the stator 45, and nnts"59 are .JtTli add ei rteiidiii g ends Yet these rods '58 'frtne ttir'pase o fcl'aihping thee Hil i'nem bers and the sections 46 of-the stat-0&4? tot'hr'F-The efianie'inbers se are so formed as to provide impeller chambers 'GOat-the 'erids of the stator 45, which connect to the outside by openings 61; =A sleeve 62is-placed 'a'foii'nd the stator 15' aha around cylindrical porti0ns 63 of the end members'56, being s' eclii e d 'ih ,plaee screws '65' which 'are 'tmadaaato the cylindrical.-porti'on 63' of the end members 56. Ope11ing's -66- "are ,forliid innit sleeve 62, as sliowiiinFigls. 1, 2 and 4, for conii'eetingthe'anniilar openings 17 to'j5O inclusive with the exterior thereof.

Extending through" the stator 45 is a rotor shaft (37 which is journaled at 68 by the end members 56. A rotor (39 is carried on the shaft 68, this rotor being positioned in the cylindrical bore 51 of the stator 15 The rotor (59 is secured in place by end caps 71 which are positioned in the impeller chambers (50 and which are secured to the shaft 67 by keys 72. The caps 71 have annular faces 73 which engage the ends of the fowl-69. Thecaps 71 have annular chan1- he rs 78 which are connected with the imp'llei chambers by means of openings formed in these caps 71.

Axial passages 81, 82, 83 and 84 are formed through tli'e'rotor 69 along the rotor shaft 67, tl'i'es'e passages connecting with the annularchambe'rs 7 of opposite caps 71. Comnin'nicating with the axial passage 81 and .1

the exterior" of the r'otor'fiSl is a radial passage 86, cominu'nlc'atin'g with the axial passage 82 and the exterior of the rotor is a earn passage '87, comm nicating with the axial pass-agate and the exterior'of the rotor is'aia'dialfpassage 88,- and communicating with 4 the axial passage 84 and'the exterior of the TOtOrfiSa radial passage'89. The radial passage 86 aligns with the annular open- 47 of'tliejs'tatori if), the radial passage 87 aligns With {the annnlar opening 48, the "radial 152fssag -88 f-tiligfis with tlie annular 'opening4;9*and the radial passage 89 aligns with the annular opening 50. i The"-ilower cap 71 ahkl theiznpper cap 71 eithe -meter unit- 39', 'beifigfdiscussed, are previaed with impeller v'anes 91; as clearly show in Figs. 2 'and '8f The impeller vanes of the lpwereap 71 i are extended, as shown in Figfiftoexeft an 11 Ward forcewhen the rote'ri s operated, and itheiinpeller.v vanes 91"?)6 the npperioap'TPare positioned to exe'rtsi downward force when the rotor is operl.=.rI; 'Z

L Eaten-din throngh' the stator '45 is a plurality of main conductors 94 which are surrbunded -by proper insulation .95. .-I-Tl1e-S8 mainfeondu'ctors '94 are preferably .flat, as shown 'i n Figi'rcrp and' have projections 97 formed at the opposite ends thereof.

The motor units 39 are secnred together by ibolts-r 98' which "extend through flanges 99 fdrmedatthe OIItBI'rP'fiItSOf the end inembers' '56. zfzlh'e ends of: the. a rotor shafts 67 liaye '-eonp1 'ing gme'mberswlOQ secured to the 'ends' thereof bykeys 101 so that theyre'st. in cavities102'.v .A'sshown clearly in Fig. 2, the coupling members are arranged in. pairs. one'of which members carries aplnrality of "pins 103 .which extend into openings 104 of the adjacent coupling member 10,0-fo'r' drivablyassociating thecoupling members to- "g'ether andxtherefore drivably associating" therotor shafts 67 together.

The main condnctorsQ L are attached togetherby means of connectors 106 vvhich extend through openings 107 formed in the end members 56. As shown in Figs. and

11, each of the connectors 106 has a metallic body 108 which is surrounded by suitable insulatingmaterial 109. The body 108 has sockets in which the flat projections 97 ot' the main conductors 9 1 are received. These connectors 106 are arranged in posi tion as the motor units 39 are attached to gether. Leads 113 of the dilierent motor units 39 are attachedfto the connectors 100 for supplying electricity to these motor units, as shown in Figs. 10 and 11. An

opening 114 is provided through the insulation 109 and through the metallic body 108. The ends of the leads 113 are extended through these openings 114 and are locked therein by means of screws 116. The upper motor, unit 39 has a cover 117 secured to the upper fiange 99' of the upper end member 56 thereof in order to close the upper end of the'unit.

"Maimfeed lines 119' extend from the surface of thegrou'nd to the motor construe tio'n through" the cable 30.- These main lines 11 tnd'through the cap'27' which is pro- R'vith ,s'uitable bushings 121', and are vi connected to'theupper connectors. 106.

The lo v'er flange'99 of the lower motor nnit'39 i's sec'iired to'a flange 12561 a centfifugalbil circulatiii'gflpumpf 126'which is interposed the motor i construction 'a'ii'dthe' ampas: Y The centrifugal oil pump 126 has an inlet 127 and an outlet 128 which:

arediar'netrically opposed; asshown in 1. \Vhen'the-pump construction" is in operation,oil is .taken' from one half'ofthe motor *cons'miriba anddelivered to the other lihItLth'ere f spape Yin "thefshell J 24 araxma *thet'm'o't'or' anus 39% 'is divided in o tiv o l'iihgitildintil' oil passages" 129' and 130. 153 idea-1st .iiYeiiLliers 131 which are r rtlendw the (interfaces ofjth'e sleeves*62. -The iiiember'sfdo iiotfhovveverfengage the 's hell 24. Eill iii portions 133 are secured" betw'een the'ehds of the "sleeves GWOfadja'cent motor uiiits39; eschew-Shown in 'Figsfi and 7 'l lic s c 'fill in ."portions' 133 are format with projections 135' to fi ll' the spaces around the flanges Screws 13mm p'royided for s'ci'irin'g'the 'fill in portions 133 in place.

s elarly shown'in Figsf5 S'and 9*;"t-he 4 pair flanges "99 vvhich are fsecuredtto getherhretpmvided with notches 137 hav jnkffl at faces 138 against which faces 139 of centralizinq iaivs 1 10 rest. The jaws 140 have 1 115 141 which extend inwardly at each side ofthe pars r flanges'99 for preventing tlieirheing removed sidewardly from place. The jaws140 have outer arcuated toothed faces 143. and the jaws 140 are'forced' by springs"' so'that the toothed faces 143 engage an inner'face'of the shell 24." Each of the pairs of flanges 99 is provided with three sets of jaws 140, which have the'tunction of centralizing the motor units 39" inside the shell 24 and of retaining them in proper alignment. The shell 24 is'kept full of cooling oil.

. The operation of my invention is substantially as follows:

Electricity is supplied to the main con-- ductors 94 of the pump construction by means of the main feed lines 119. The electricity is taken from the main lines 9 1 and delivered to the motor units 39 by means of the branch lines 113. When the motor units 39 are energized, the rotors 69 are re- \olVed. All of the rotors, being coupled together, cooperatively actuate the internal mechanism (not shown) of the pump 26. The pump 26 at this time draws oil through the port 3 1 and delivers it through the port 30 to the interior of the well casing 20.

The mechanism of the oil- "circulating pump 126 atthis time is operated, and the cooling oil in the shell 24 isdrawn into the inlet 127 and delivered throu'ghthe. outlet 128. Due 'to the fact that the interior :Of the shell 24 around the motor units 39 is divided into two longitudinalxpassages 129 and'130, the oil willflow upward through the passage i30and1downward through the passage'129: cooling oil fiows -into'the impeller chambers 60 (if ththiroto11mints-=39 through the "opening -61 provi ded in -the end members 56. The coolingoilpasses: into the annular chamber 7 8 of: thecaps .71 through-the openingsi' 9 and passes through the'a-Xial pas" sages" 81"[t'o 84rinclusive of the-rotors 69. This 'oil'is drawn outwardly from these=passages" by centrifugal force through the; radial passages 86t0 89=inclu"sive. Theioibis-by reason of the centrifugal Y forceicausedto flow through j the annular openings .47 I to '50 inclusive oftheistators 45and =flowskto the interior of themotomunits 39 through the op'ening s 66 *of the sleve s 62. The impeller H These aws 1 10 are self-adjusting and not only firmly hold the motor Hinits 39 inplace but they also centralize them and retain them i'n'proper operating alignment.

From the foregoing description the various. features of my invention are" apparent. The feature of providing oil cooling circulainto contact with the interior of the rotor around the rotors 69..

and the stator-and bet-ween the two, thus providing'ctii 'eiit cooling. The rotors (it) serve as impellers for circulating the cooling oil through the motor-units 3 This is a \"C1' important feature whiclrcan be conveniently .and econondcallyincozporated in the motor units. The iinpel-le rya-nes 91 are also valuable inestablishiuga cooling circulation through the cylindrical bores- 51 It may under certain circumstances =l e .desirable only t0.use the circulation through the rotors and statois, or only between the rotors and the stators. fl he centralizing means of my inventionpermits a very ready assembling of the motor units 2 9 i 1nd the i r assembling in the shell 24. 'lhe-selflo'cking and self-adjusting features ot, .the central iz ing jaws 140 are important." It; should be understood that in the drawings I hav shown the motor construction as including only-two units, but-inactnal practice Ln ay use I quite a number -of;-rno tor units,'. whicl i form a motor construction ,of eo siderable length. It is in ilong mot or .constructions that the cent-ralizing;:'ineans. sl Qwn is i stl valuable. In mot-or constructions.employ ing only two units, it would hegpossible to use pins or other means fori securing the units39 in the shell 24. The use= o.f the connectors 10S and-their particular ,construction permits a quick attachinguif the inain;con-, ductors 94 together, which attachment may be accomplished when'the motor units 2-39 are lacing secured together. 1 claim as my in--'.entipr i H? L 1.?In an electrical powei'iinit, thetcombh nation 10f: a fluid-tight shell containing "a. hodyiofoil serving as an electrical insulating and circulatin'g coolingmedium; ,an electric motor entirelyand continuously sabmerged in-said oil and spacedfrom said shell to form-an annular oil chambersurrounding said mo-':0r,-said. motor comprised of a stator having a cylindricalboreanda plurality of transverse passages communicating only with said bore and said oil chamber andarotor arranged in said bore-and provided with an axial passage theret-hrough anda-pluralit-y of radial ports communica'ti iig with said axial essee;

passage and thebore of the stator, said ports being respectively aligned with said transverse passages in the stator, whereby when the-rotor is revolved the oil is drawn through said axial passageand expelled through said radial ports and said transverse passages into said oil chamber; and means for maintaining such circulation while the notor is in operatIOII.

2. In an electrical power unit, the combination of: fluid-tight shell containing a body of oil serving-as an electrical insulating ai dacirculating cooling medium; an electric motor entirely and continuously. submerged in said oil and spaced from saidshell to form an annular oil chamber surrounding smid ,motor said anotor coi 'ipi ised of a stator having a cylindrical bore .and a plurality of transne rse; pa ssa ges .com mun iea ting only with 31116111011; uidsaidoil chamher, and a .rotor arranged i .-s:tid., bore and provided. with ian axialpassage ei:ethroi1 glisand a plurality of radial ports communicating with is aid lt lttl Ptggtlilghfillg bor e .of,the stator, said wa he s. res ect e .a -i i h i univer e pagag s. ti -.111 statorfivherqh i when ;tl e rotor is revolved the oil is d raiiiin wmie i sa d .as a mi s" 5nd -*r tl irou radial ,ports. and said transverse passages nto said oil ehanihen; inaii'iibsmat s 9 P2 l- $l 9 i' i 1-, e e nd ts a d; iaml per s icoininim iEat-iiig o P'. w th said ,ag al ifotqilp assage .ajid I said er 2 9 ete rbqt lan wiaiai nn elisham i zraednm a s wi iims' Q i t re" en ehan'il e sv and rota' table with said sten fer maiii nil mia iii i i er oil Chamber lIiilO aidend chambers and forcing 3. ln an, lec trica; a -sin i. flco hi n o f. fluid ight i li ll helm-st se -raises Ret ine s sr erqi eiile in m'sm; "iiri Qleqtric. inotogent rely .a id co'ntiniiously sub; leg ls? sat-a s re 'Q fit a t J'WH 9 lflfifiiludlfimliy stinguiding udmptqg md ma er; reiimrisednfi -s h r i msa-c l ndr alMirie l of transyersepassages communicating with said bore and saidloil chamber, and a rotor arrag in. said here; and pro ided .with an e i la es e -itl rs sushi a lplurality of rad al rp'o gts cginin n icating lisaid ax al mssage and bri refof the stator; said ports be ng respeetiyelyiialigned with .said transigerse passages; :in the stator, whereby when the rotor is?reYoliged the oil v is drawn through said axiall ipassage aiidexpelled throughsaid. radial .ports. antlsa id transverse passages into said,.:oi 1. chamber; means vfor maintaining .suclrciiculation while the; motor s in operation; neans longitudinallydividing-said annular oil chambentoiform opposite longitudinal oilflpassages extending the fulldengtlrof=said-inotor .andjmeansior efins fecting a constant circulation of oil through said longitudinal oil passages respectively in opposite axial directions.

4. In an electrical power unit, the combination of: a fluid-tight shell containing a body of oil serving as an electrical insulating and a circulating cooling medium; an electric motor entirely and continuously submerged in said oil and spaced from said shell to form an annular oil chamber surrounding said motor, said motor comprised of a stator having a cylindrical bore and a plurality of transverse passages communicating with said bore and said oil chamber, and a rotor arranged in said bore and provided with an axial passage therethrough and a plurality of radial ports comn'iunicating with said axial passage and the bore of the stator, said ports being respectively aligned with said transverse passages in the stator, whereby when the rotor is revolved the oil is drawn through said axial passage and expelled through said radial ports and said transverse passages into said oil chamber, means enclosing the opposite ends of said stator and rotor and forming end chambers, coinmuni' catin with said axial rotor passage and said cylindrical stator bore and with said annular oil chamber; impeller means within said respective end chambers and rotatable with said rotor for drawing oil from said annular oil chamber into said end chambers and forcing said oil towards the center of said motor; partition means longitudinally dividing said annular oil chamber to form opposite longitudinal oil passages extending the full length of said motor; and an oil pump for circulating oil up one of said longitudinal passages and down the other of said longitudinal passages.

5. In an electrical power unit, the combination of: a fluid-tight shell containing a body of oil serving as an electrical insulating and a circulating cooling medium; an electric motor entirely and continuously submer ed in said oil and spaced from said shell to form an annular oil chamber surrounding said motor; means longitudinally dividing said annular oil chamber to form opposite longitudinal oil passages extending i 

